﻿// Pixeval - A Strong, Fast and Flexible Pixiv Client
// Copyright (C) 2019-2020 Dylech30th
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
// 
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

using System;

namespace Pixeval.Core
{
    public class EnumeratingSchedule
    {
        private static object _currentItr;

        public static void StartNewInstance<T>(IPixivAsyncEnumerable<T> itr)
        {
            var iterator = _currentItr as IPixivAsyncEnumerable<T>;
            iterator?.Cancel();
            GC.Collect();
            AppContext.DefaultCacheProvider.Clear();
            _currentItr = itr;
        }

        public static IPixivAsyncEnumerable<T> GetCurrentEnumerator<T>()
        {
            return _currentItr as IPixivAsyncEnumerable<T>;
        }

        public static void CancelCurrent()
        {
            var iterator = _currentItr as ICancellable;
            iterator?.Cancel();
            GC.Collect();
            AppContext.DefaultCacheProvider.Clear();
        }
    }
}